Poll Engine Color
red,
although one advantage to painting it hemi orange is you can get that in a quart can of acrylic enamel and spray it on using a real paint gun. I did that with a 340 engine the year before last using some old Candy apple red ('66 Ford Bronco color) and it turned out looking great (and does not stain when exposed to anti-freeze or other fluids like the MP paint does!!).
Bob